@MBanski Yes, this API is no longer available. You can use the language studio to do the update or use the Import API to import your project with the new list updated in the listkey.
The recommended way to do this is to use the export API to export your project JSON and then update the list and run the Import API. The change through the studio also performs the same operation.
A sample of CLU project JSON is available on the github sample page for reference.
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